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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ 18,175,420 $ (4,153,140) $ 12,264,400
Change in unrealized gain (loss) on open futures contracts 7,451,120 (11,877,420) 3,255,030
Dividend income 533,922 408,899 173,888
Interest income [1] 1,383,419 1,284,171 654,768
ETF transaction fees 6,650 13,300 10,850
Total income (loss) 27,550,531 (14,324,190) 16,358,936
Expenses      
General Partner management fees (Note 3) 656,053 721,836 756,539
Professional fees 90,200 111,160 336,708
Brokerage commissions 101,742 98,880 132,707
Directors' fees and insurance 19,301 15,970 13,325
Total expenses 867,296 947,846 1,239,279
Expense waiver (Note 3) (80,032) (81,642) (331,433)
Net expenses 787,264 866,204 907,846
Net income (loss) $ 26,763,267 $ (15,190,394) $ 15,451,090
Net income (loss) per limited partnership share $ 5.73 $ (3.00) $ 2.48
Net income (loss) per weighted average limited partnership share $ 5.76 $ (3.14) $ 2.24
Weighted average limited partnership shares outstanding 4,646,301 4,836,438 6,888,630
[1] Interest income does not exceed paid in kind of 5%.